Java tutorial
/* * Copyright 2015 JBoss, by Red Hat, Inc * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.uberfire.ext.plugin.client.widget.media; import java.util.ArrayList; import java.util.Collection; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.annotation.PostConstruct; import javax.enterprise.context.Dependent; import javax.enterprise.event.Observes; import javax.inject.Inject; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.Style; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.FormPanel; import com.google.gwt.user.client.ui.IsWidget; import com.google.gwt.user.client.ui.RequiresResize; import com.google.gwt.user.client.ui.Widget; import org.gwtbootstrap3.client.ui.Button; import org.gwtbootstrap3.client.ui.Caption; import org.gwtbootstrap3.client.ui.Column; import org.gwtbootstrap3.client.ui.Form; import org.gwtbootstrap3.client.ui.Image; import org.gwtbootstrap3.client.ui.Row; import org.gwtbootstrap3.client.ui.ThumbnailPanel; import org.gwtbootstrap3.client.ui.base.form.AbstractForm; import org.gwtbootstrap3.client.ui.constants.ColumnSize; import org.gwtbootstrap3.client.ui.constants.IconType; import org.gwtbootstrap3.client.ui.constants.ImageType; import org.gwtbootstrap3.client.ui.html.Paragraph; import org.uberfire.backend.vfs.Path; import org.uberfire.ext.plugin.client.config.PluginConfigService; import org.uberfire.ext.plugin.event.MediaAdded; import org.uberfire.ext.plugin.event.MediaDeleted; import org.uberfire.ext.plugin.model.Media; import org.uberfire.ext.widgets.common.client.common.FileUpload; import org.uberfire.ext.widgets.common.client.common.FileUploadFormEncoder; import org.uberfire.mvp.Command; import org.uberfire.mvp.ParameterizedCommand; @Dependent public class MediaLibraryWidget extends Composite implements RequiresResize { private static ViewBinder uiBinder = GWT.create(ViewBinder.class); @UiField FlowPanel content; @UiField Form form; @UiField(provided = true) FileUpload fileUpload; @UiField Row library; private FileUploadFormEncoder formEncoder = new FileUploadFormEncoder(); @Inject private PluginConfigService pluginConfigService; private String pluginName; private ParameterizedCommand<Media> onMediaDelete; private Map<Path, IsWidget> mediaRef = new HashMap<Path, IsWidget>(); private List<Command> updateMediaOnSaveCommands = new ArrayList<>(); private List<Command> updateMediaOnCloseCommands = new ArrayList<>(); @PostConstruct public void init() { fileUpload = createFileUpload(); initWidget(uiBinder.createAndBindUi(this)); form.setEncoding(FormPanel.ENCODING_MULTIPART); form.setMethod(FormPanel.METHOD_POST); formEncoder.addUtf8Charset(form); form.addSubmitHandler(new AbstractForm.SubmitHandler() { @Override public void onSubmit(final AbstractForm.SubmitEvent event) { final String fileName = fileUpload.getFilename(); if (isNullOrEmpty(fileName)) { event.cancel(); } } private boolean isNullOrEmpty(final String fileName) { return fileName == null || "".equals(fileName); } }); form.addSubmitCompleteHandler(new AbstractForm.SubmitCompleteHandler() { @Override public void onSubmitComplete(final AbstractForm.SubmitCompleteEvent event) { if ("OK".equalsIgnoreCase(event.getResults())) { Window.alert("Upload Success"); } else if ("FAIL".equalsIgnoreCase(event.getResults())) { Window.alert("Upload Failed"); } else if ("FAIL - ALREADY EXISTS".equalsIgnoreCase(event.getResults())) { Window.alert("File already exists"); } } }); } public void setup(final String pluginName, final Collection<Media> mediaLibrary, final ParameterizedCommand<Media> onMediaDelete) { this.pluginName = pluginName; this.onMediaDelete = onMediaDelete; this.mediaRef.clear(); this.library.clear(); for (final Media media : mediaLibrary) { addMedia(media); } } private FileUpload createFileUpload() { return new FileUpload(new Command() { @Override public void execute() { form.setAction(GWT.getHostPageBaseURL().replaceAll("/" + GWT.getModuleName(), "") + pluginConfigService.getMediaServletURI() + pluginName); form.submit(); } }, true); } @Override public void onResize() { getParent().getElement().getStyle().setBackgroundColor("#F6F6F6"); content.getElement().getStyle().setTop(60, Style.Unit.PX); } public void onNewMedia(@Observes final MediaAdded mediaAddedEvent) { if (mediaAddedEvent.getPluginName().equals(pluginName)) { final Media media = mediaAddedEvent.getMedia(); addMedia(media); updateMediaOnCloseCommands.add(new Command() { @Override public void execute() { onMediaDelete.execute(media); } }); } } public void onMediaDelete(@Observes final MediaDeleted mediaDeleted) { if (mediaDeleted.getPluginName().equals(pluginName)) { final IsWidget thumb = mediaRef.get(mediaDeleted.getMedia().getPath()); if (thumb != null) { library.remove(thumb); } } } public void addMedia(final Media media) { final Column column = new Column(ColumnSize.XS_4); final Button trash = new Button(); trash.setIcon(IconType.TRASH); final ThumbnailPanel thumbnail = new ThumbnailPanel() { { add(new Image(media.getPreviewURI()) { { setType(ImageType.CIRCLE); setHeight("140px"); setWidth("140px"); } }); add(new Caption() { { add(new Paragraph(media.getExternalURI()) { { getElement().getStyle().setProperty("maxWidth", "180px"); } }); add(new Paragraph() { { add(trash); } }); } }); } }; trash.addClickHandler(getTrashClickHandler(media, column)); column.add(thumbnail); library.add(column); mediaRef.put(media.getPath(), column); } private ClickHandler getTrashClickHandler(final Media media, final Column column) { return event -> { mediaRef.remove(media.getPath()); updateMediaOnSaveCommands.add(new Command() { @Override public void execute() { onMediaDelete.execute(media); } }); library.remove(column); }; } public void updateMediaOnClose() { for (Command command : updateMediaOnCloseCommands) { command.execute(); } } public void updateMediaOnSave() { for (Command command : updateMediaOnSaveCommands) { command.execute(); } updateMediaOnCloseCommands = new ArrayList<>(); } interface ViewBinder extends UiBinder<Widget, MediaLibraryWidget> { } }